Status of PEP's?

[Gonçalo Rodrigues]

On Mon, 04 Mar 2002 19:59:03 -0800, David Eppstein
<eppstein at ics.uci.edu> wrote:

>In article <7xwuwrofhk.fsf at ruckus.brouhaha.com>,
> Paul Rubin <phr-n2002a at nightsong.com> wrote:
>
>> Usually the term "natural numbers" don't include zero.
>> http://mathworld.wolfram.com/NaturalNumber.html
>
>I think "usually" is an exaggeration.  For instance, a better authority 
>than Weisstein, Ebbinghaus et al's _Numbers_ (Springer Graduate Texts in 
>Mathematics 123, 1991, p. 14) disagrees

As a practising/learning mathematician I always understood natural
numbers to include the 0.